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Link’d DMR
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Code68 recovery · Code67 withdrawn

Professional Push-to-Talk
That Works Like a Radio

Code68 fixes the Code67 startup crash and restores the original schema-12 all-features app. Install it directly over Code66 or Code67 without uninstalling or clearing data; customer-created Enhanced Privacy keys and app data stay in place.

Explore Link’d BusinessDownload Public Beta
  • Radio-Style Cellular
  • Site · Team · Channel
  • Exact CJ-1 RF
  • Security-First Access
Current signed beta0.2.65
Current Link’d DMR CJ-1 radio screen with live radio status, channel details, device information, and the large hold-to-talk control

Real Android screens from the approved public beta — no concept UI.

Get started

Choose the path that matches your device

Reach a working first test without sorting through radio-only details that do not apply to you.

Use cellular PTT on Android

Install the beta, create one account, register your phone, and join a private group.

Start Android setup

Set up a verified CJ-1

Complete cellular setup, verify the exact hardware and selector, then arm the guarded RF path.

Start CJ-1 setup

Manage a team

Register devices, create private groups, invite members, and review active sessions.

Open account tools
New · CPS 2.0 is here

The radio screen is small. Programming it doesn't have to be.

Link'd DMR CPS brings professional RF codeplug programming to Windows with a clear Zones → Channels → Editor workflow, full-size tables, and guided Read and Write progress.

Explore CPS 2.0Download for Windows
Current Link'd DMR CPS 2.0 Zones screen with professional category navigation and full-width zone programming

Actual current CPS interface · Zones workspace

  • Built for the big screen

    Program zones, channels, contacts, scan lists, and supported RF settings from a spacious Windows workspace.

  • Professional channel workflow

    Choose a zone, open its channel list, then edit the complete General or RX/TX record without cramped three-pane views.

  • Protected programming

    Guided Read and Write windows show backup, transfer, verification, completion, and recovery status as it happens.

New · Invite-only public beta

Link’d Business + Link’d Command

Professional push-to-talk for security, hospitality, and field teams.

Operators get a focused radio-style Android experience. Authorized managers organize sites, teams, invitations, and one managed channel per team in Link’d Command.

Explore Link’d BusinessInvited? Open Command

FIELD RADIO

Android + supported CJ-1

LINK’D COMMAND

Sites, teams, members, and coarse live status

SERVER ENFORCED

Approved entitlement and scoped channel access

Approved Business beta entitlement required. Android is supported; no iPhone app or browser PTT is currently offered.

Approved / invite-only public beta

Professional radio controls for Android teams

Link'd DMR 0.2.65 Public Beta gives regular Android phones the same focused operating pattern people expect from a professional radio: current Channel and activity, readable operating states, and hold-to-talk anchored at the bottom. Approved businesses manage Sites, Teams, invitations, and one private cellular Channel per Team. Security companies are the lead use case, but the model also fits approved hospitality, construction, warehouse, event, education, transportation, retail, and other pilots. Exact-CJ RF safety boundaries remain unchanged.

Read the announcement

  • Approved Business access

    Use one Link’d identity across the website and Android app; organizations require beta approval and members join by invitation.

  • Site, Team, and Channel

    Organize each operation by Site and Team, with exactly one managed private cellular Channel for every Team.

  • Android cellular PTT

    Use server-enforced hold-to-talk over Wi-Fi, 4G, or 5G on Android 8.0 and newer. No iPhone app is offered.

  • A radio for the operator

    Cellular puts the active Channel, current activity, and clear operating state up front while keeping push-to-talk fixed at the bottom.

Approved Team membership, an active account session, and a registered Android device authorize cellular audio and PTT floor control; Team Channels do not authorize RF bridging. The cellular service uses transport encryption but is not end-to-end encrypted, has no TURN/TLS fallback for restrictive networks, and supports at most 64 concurrent participants in a Channel. Screen-off physical side-key PTT and Enhanced Privacy are exact-CJ features; Enhanced Privacy is legacy ARC4-40 interoperability. Android only; no iPhone app. This beta is not for emergency communications.

Code68 recovery · Code67 withdrawn

The original all-features app is restored

Code68 fixes the Code67 startup crash and is safe to install directly over Code66 or Code67 without clearing data. It restores the correct schema-12 database and preserves Enhanced Privacy, accounts, Business, CPS, channels, contacts, settings, and all seven reviewed CJ-1 tracks. Scanner V2 and the widget will return only after a correct rebase and live-device testing.

See what is included and what stays gated

Core capabilities

One app for connected and off-grid communication

Link’d DMR is being developed around six core capabilities that cover everyday cellular push-to-talk, offline mesh networking, and optional real radio bridging.

  • Cellular PTT

    Approved-beta radio-style push-to-talk over Wi-Fi, 4G, or 5G on Android 8.0+ with readable operating states and server-enforced floor control.

  • Direct Nearby Coordination

    Code68 includes bounded direct-device queues and reconciliation, but the surface stays unavailable until a reviewed production transport adapter is configured. Multi-hop is not claimed.

  • Exact CJ-1 Radio Home + RF

    A verified exact CJ-1 adds the compact radio home and can use the local DMR and analog RF beta. Phone-to-radio gateway bridging remains under validation.

  • Site, Team, and Channel

    Authorized Business managers organize operations by Site and Team. Each Team currently receives exactly one private cellular Channel.

  • Multi-Industry Operations

    Security companies are the lead use case, with the same operating model available to approved hospitality, construction, warehouse, event, education, transportation, retail, and other pilots.

  • Security-First Relay

    Unverified communication paths stay unavailable instead of pretending a transmission succeeded.

Radio bridge

How it works

A compatible gateway such as the CJ-1 sits between an existing radio system and Link’d phone users, relaying live audio in both directions.

Existing radio users
CJ-1 or compatible gateway
Link’d phone users

Radio to phone

  1. A radio user transmits on the configured DMR or analog system.

  2. The supported gateway receives the RF call.

  3. Link’d forwards the authorized live call to connected phone users.

Phone to radio

  1. A phone user presses PTT.

  2. Link’d delivers the live audio to the authorized gateway.

  3. The gateway keys the selected radio channel or talkgroup and retransmits it.

Gateway support depends on the exact device, radio interface, licensing, configuration, and successful hardware validation.

Diagram: how Link’d DMR bridges phones and radios — a repeater or radio system connects through a MOTOTRBO ION or CJ-1 gateway running Link’d, which relays audio both ways between DMR radios and remote phone users on cellular or Wi-Fi
How Link’d DMR bridges phones and radios through a compatible gateway

Offline mesh

Direct Nearby coordination is included but gated

Code68 includes bounded direct-device coordination queues and safety checks. Nearby stays unavailable until a reviewed production transport adapter is configured; Link’d makes no multi-hop or verified range claim in this beta.

  • Code68 includes a bounded queue for canned status, check-ins, and assignments.

  • The included safety model is direct-device and one-hop only.

  • Entries expire, deduplicate, and require authorization re-checks and explicit receipts.

  • Nearby stays unavailable until a reviewed production transport adapter is configured.

  • Multi-hop forwarding, gateway bridging, and verified field range are not claimed in this beta.

Estimated range

Direct Nearby coordination is included in Code68 but remains unavailable without a reviewed production transport adapter. Link’d does not claim multi-hop delivery or a verified field range; eventual results will depend on terrain, device hardware, mounting, interference, and line of sight.

Infographic: Link’d DMR offline coverage options — phone-to-phone mesh at roughly 100 to 500 feet per hop, vehicle or camp relays at 500 to 1,500 feet, basic directional bridges at 0.5 to 3 miles, elevated directional bridges at 3 to 10 miles, and large professional dishes at 10 to 20 or more miles; estimates only, actual range depends on terrain, obstacles, line of sight, phone hardware, antenna setup, and interference
Estimated offline coverage options by setup

Compatibility

What works with Link’d DMR

Android 8.0+ phones join the cellular-first public beta. Exact verified CJ-1 hardware adds the compact radio home and guarded RF beta; other radio hardware remains planned.

  • Regular Android phones

    Approved public beta on Android 8.0+

    • Account-authorized cellular PTT
    • Assigned private Team Channels
    • Exactly one managed cellular Channel per Business Team
    • On-screen hold-to-talk
    • Shared website and app account
    • No iPhone app in the current beta
    • Nearby remains gated without a production transport adapter

  • Verified CJ-1 radio phone

    Additional public-beta RF capabilities after exact verification

    • Compact, performance-first radio home
    • Saved caller name plus always-visible Radio ID
    • GROUP / TG and PRIVATE / ID destination context
    • Real DMR / analog RF
    • Physical side-key PTT, including screen-off
    • Enhanced Privacy ARC4-40 interoperability
    • Channel and talkgroup integration
    • Signed-out local RF operation

  • Future adapters

    Possible future targets

    • Other Android radio phones
    • Officially documented hardware APIs
    • Approved MOTOTRBO/WAVE integrations
    • Private experimental adapters kept outside the public build

Compatibility is limited to the devices and integrations listed above. Universal radio or hardware compatibility is not claimed.

Full compatibility details

More testing programs

Help test the rest of Link’d DMR

Cellular PTT, the exact-CJ RF path, and the seven Code68 tracks are in the downloadable public beta. Automatic and Nearby controls stay safely gated without their production adapters. For adapter, additional gateway, and hardware tests, tell us about your team, devices, and use case.

Do you own a CJ-1?

Signed public beta

Download Link’d DMR for Android

Install the signed beta on Android 8.0 or newer and compare its published checksum first. Regular Android remains cellular-first; selector 01 verification is required only before using exact-CJ RF features.

Public beta available

Link'd DMR 0.2.65 Public Beta

Signed Android 8.0+ APK with cellular-first PTT and the compact exact-CJ radio home.

Released August 27, 2026Android 8.0+ cellular; verified Android 14 / API 34 CJ-1 firmware family for RF72.3 MiBBuild 68
CJ-1 RF verification

63 qualified downloads countedLive verified count. repeat starts from the same browser that day count once.

CJ-1 verification is required only for RF features

Regular Android 8.0+ phones can install the app and use the cellular beta without this hardware check. Before enabling CJ-1 RF or Enhanced Privacy, use the website compatibility tool and continue only when it confirms the exact CJ_1UV, a supported DMR003N.UV4P.V### live layout, and selector 01. The app cannot independently distinguish selector 05 from selector 01.

What is included

  • Replaces the withdrawn Code67 build with a forward-installable recovery that restores the proven schema-12 database and original all-features app baseline.
  • Fixes the Code67 startup crash affecting existing customers, including customers who never configured Enhanced Privacy; the crash was caused by an incorrect database-version rollback, not by a customer privacy key.
  • Keeps the same Android package and production signing certificate with version code 68, so customers can install Code68 directly over Code66 or Code67 without uninstalling, clearing storage, or losing app data.
  • Preserves Enhanced Privacy, accounts, Link'd Business, CPS, channels, contacts, settings, and the seven reviewed CJ-1 feature tracks from Code66.
  • Does not create a default Enhanced Privacy key or show one as saved. A saved key exists only after the customer explicitly enters and saves it.
  • Withdraws Scanner V2 and the home-screen widget from this emergency recovery because their Code67 build used the wrong older base. They will be republished only after a correct rebase and live CJ-1 validation.
  • Preserves the signed public-beta build 66 feature set with all seven reviewed CJ-1 tracks while retaining the established package and signing identity for in-place updates.
  • Adds role-gated Dispatcher Lite incident assignment, release, and accountability controls backed by the existing server-authorized organization boundary.
  • Adds deliberate manual RF and Cellular path selection with a keyed-call interlock. The Automatic engine remains safely unavailable when its production adapter is not configured.
  • Adds bounded direct Nearby coordination queues for canned status, check-ins, and assignments with expiry, deduplication, authorization re-checks, and receipts. Nearby remains safely unavailable without its production transport adapter, and this build does not claim multi-hop delivery.
  • Adds validated physical-control routing for supported CJ-1 profiles, including debounced actions and clear user feedback, while leaving unknown mappings unavailable.
  • Adds Bluetooth PTT and audio-route state with visible confirmation and fail-closed transmit release when an approved accessory disconnects.
  • Adds audience-bound, expiring, replay-safe signed configuration handoff with local review, durable receipts, verification, backup, and rollback boundaries; there is no silent remote radio or firmware programming.
  • Adds privacy-safe field diagnostics for coarse thermal state, reconnect and transport history, and module state while excluding audio, transcripts, precise location, credentials, tokens, and private keys.
  • Publishes signed public-beta build 65 with the sealed V1/V2 Professional Operations compatibility validation. The package identity and signing certificate remain unchanged, so existing public-beta testers can update in place.
  • Fixes a stale connection-generation race that could leave Cellular PTT offline after the server had already issued a valid grant. A connection now proceeds only while the exact current authorization and media generation remain accepted, and presence is published after the room joins.
  • Makes the supported CJ-1 Diagnostics Restart a fail-closed, generation-fenced transaction that restores the exact durable zone and channel only on the accepted successor radio service.
  • Preserves the selected channel, privacy state, and unkeyed PTT boundary across service restart; a superseded, failed, or incomplete restart remains locked instead of reporting a false success.
  • Completes physical acceptance on Samsung Galaxy S25 and exact CJ-1 hardware, including clean Cellular connect and disconnect, CJ-1 restart continuity, and bounded CJ-1-to-Android receive audio.
  • Adds the explicit Link'd Business schema 2 contract so Android accepts the multi-industry organization profile and server-provided Site, Team, and Channel labels without hiding authorized Cellular Team Channels.
  • Keeps the strict authorization and one-private-Cellular-Channel-per-Team model unchanged while making workspace refresh and invitation acceptance compatible with the deployed Business schema 2 response.
  • Brings the professional radio operating pattern to Cellular on regular Android phones and CJ-1: a clear Channel and activity view, readable READY, RECEIVING, and TRANSMITTING states, and bottom-anchored hold-to-talk.
  • Expands Link'd Business into a Security-first, multi-industry Site, Team, and Channel workspace and adds the protected Link'd Command dashboard for coarse online presence, current speakers, Team rosters, pending invitations, and recent administrative activity.
  • Business Team selection delegates the existing account-authorized Cellular PTT path, with exactly one private Cellular Channel per Team; it does not add a second PTT engine or change the CJ-1 RF channel selector.
  • Business workspace state remains outside the RF codeplug, CPS, Enhanced Privacy keys, owner recording files, credentials, and firmware surfaces.
  • Adds the protected Link'd DMR CPS 2.0 companion bridge for reading and writing the non-secret RF codeplug over authenticated USB ADB.
  • CPS programming can request a safe radio-service stop before commit, then performs token-bound backup, transfer, verification, finalize, and recovery handling.
  • Recordings, archives, credentials, history, privacy key bytes, firmware, and flashing controls remain outside the CPS bridge and are not exposed to Windows.
  • Cellular now opens to a compact radio-first screen with group and current activity up front instead of a long control page.
  • The Cellular PTT control stays anchored at the bottom of the screen, so it is ready without scrolling while group, people, and advanced details remain available.
  • Enhanced Privacy now uses clear operational ON, OFF, READY, and APPLYING language; the feature is no longer presented as beta when supported hardware is active.
  • Saved privacy keys and technical interoperability details move into optional Manage Keys and Advanced sections without changing the guarded hardware behavior.
  • Optional local radio sounds are off by default and can be enabled by the user, including the custom key sound after transmit; cues never become part of incoming transmission recordings.
  • Public-beta signup and sign-in work on both linkddmr.com and the Android app without a signup token.
  • Android 8.0+ testers can use account-authorized cellular PTT with private groups and server-enforced floor control.
  • Signed-in testers can register devices, create private groups, and issue email-bound, single-use invitations to friends.
  • Regular Android devices remain cellular-first; the compact radio home, local RF, and physical side-key features appear only on eligible exact-CJ hardware.
  • The exact-CJ radio home adds a compact, performance-first channel view with live caller identity: a saved caller name when known and an always-visible numeric Radio ID.
  • The exact-CJ destination display distinguishes GROUP / TG from PRIVATE / ID calls, including the saved group or contact name when available.
  • CJ-1 and regular Android users now share a server-assigned numeric Linkd Radio ID, current-talker identity, device badge, transport, and group destination on the main PTT experience.
  • The active-channel directory shows the complete bounded roster, online state, role, and Android or CJ-1 badge; the main screen keeps a compact four-radio preview for performance.
  • Owners and authorized managers can send consent-based ring alerts and perform role-bounded remove, suspend, revoke-cellular, ban, and restore actions with confirmation, audit receipts, and safe retry recovery.
  • Manager actions control LinkdDMR account and cellular access only; this release adds no covert listening, RF bricking, firmware kill, or remote microphone activation.
  • Cellular PTT now uses direct LiveKit wiring, balanced touch and accessibility hold behavior, and truthful KEYING and TRANSMITTING states.
  • Cellular PTT release, renewal, reconnect, and teardown work is bound to the exact session and floor cycle, preventing a late response from disconnecting a healthy or replacement session.
  • Exact-CJ Night and Outdoor display modes, diagnostics, scan status, RF or Cellular provenance, and guarded RF-to-Cellular navigation are connected to real app behavior.
  • Exact-CJ shortcuts open real Last Heard, Contacts or Save ID, Channels, Scan, Settings, and guarded Cellular destinations.
  • The eligible exact-CJ local RF path remains usable while signed out, including saved per-channel Enhanced Privacy keys and quick channel switching.
  • On an armed exact CJ-1, the physical side key can remain available while locked, screen-off, or outside the app.
  • The beta keeps the same package and signing identity as the earlier CJ-1 field build, so existing testers can update in place.

Beta limits

  • Code68 is the urgent recovery release for the withdrawn Code67 build. It deliberately restores the proven Code66 all-features application and database baseline; Scanner V2 and the home-screen widget will return only after they are correctly rebased and live-device tested.
  • Enhanced Privacy never creates or labels a key as saved for a customer who did not save one. Existing user-created privacy keys remain local and are preserved during an in-place update.
  • Code66 includes all seven CJ-1 feature tracks, but Automatic path selection remains unavailable unless a reviewed production handoff adapter is configured. Manual RF and Cellular selection stays fail-closed and cannot change paths while PTT is keyed.
  • Nearby coordination includes the bounded direct-device queue, authorization, expiry, receipt, and reconciliation surfaces, but Nearby remains unavailable unless a reviewed production transport adapter is configured. This release makes no multi-hop or verified range claim.
  • Secondary physical-control actions depend on an explicitly supported and validated hardware profile. Unsupported mappings remain unavailable rather than guessing at key events.
  • Link'd Business is an approved or invite-only public beta for Security teams and other multi-industry pilots. Workspaces use Site, Team, and Channel, with exactly one private Cellular Channel per Team, plus scoped roles, invitations, and the management-only Link'd Command dashboard.
  • Link'd Command does not provide browser PTT, location tracking, work orders, safety automation, transcription, or AI features in this release.
  • The CPS bridge programs the app-owned RF codeplug only. It is not direct RF-module or firmware readback, and entity deletion remains unavailable during live programming in this release candidate.
  • Cellular PTT supports Android 8.0 and newer, but device-specific background restrictions can vary; screen-off physical side-key PTT is an exact-CJ feature, not a generic Android promise.
  • Local RF and Enhanced Privacy remain limited to the exact Android 14 / API 34 CJ_1UV and supported DMR003N.UV4P.V### live firmware layouts after the website tool verifies selector 01.
  • The self-hosted LiveKit selective-forwarding server transport-encrypts cellular audio but the cellular path is not end-to-end encrypted.
  • The cellular beta has no TURN/TLS relay fallback, so restrictive Wi-Fi or mobile networks may fail.
  • A cellular talkgroup room is limited to 64 concurrent participants during the beta.
  • Current private-group membership, an active account session, and a registered Android device authorize cellular PTT; cloud membership does not authorize RF bridging.
  • Enhanced Privacy is legacy Motorola-compatible ARC4-40 interoperability, not modern encryption.
  • After a force-stop or reboot, reopen Link'd DMR; exact-CJ RF users must reconnect the radio and arm physical PTT again.
  • This is field-test software, not a production or emergency-communications release.

Verify your download

APK SHA-256
ABF7C9AB3CBC9580F8D5BE35DEA5F228C57D504C8919C244937E440E750BEE58
Signing certificate SHA-256
34A1B38342F03C62E9A07692FA8A7FCE0EDEE4111EB4CE9C7B746ED957AA0639
Android package
com.linkd.dmr.ownertest · version 0.2.65-cj1-public-beta · code 68
Read the full release announcement

Status

Platform status

Live service health

Degraded service

4/6

Components operational

30 sec

Automatic refresh

Public-safe

No private infrastructure exposed

  • Website and public APIOperational
  • Accounts and private groupsOperational
  • Cellular PTT authorizationDegraded
  • Cellular media serviceDegraded
  • Retention data safeguardsOperational
  • Signed beta downloadsOperational

Incident history

No confirmed public incidents have been recorded since live monitoring began. New incidents will appear here after they are verified and resolved.